Nissan Qashqai (2007-2010). Manual - part 161

P0138 HO2S2

EC-163

< COMPONENT DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

>> INSPECTION END

EC-164

< COMPONENT DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

P0139 HO2S2

P0139 HO2S2

Description

INFOID:0000000001082945

The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the heated oxygen sensor 1 are
shifted, the air-fuel ratio is controlled to stoichiometric, by the signal
from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1V in richer conditions to 0V in leaner condi-
tions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.

DTC Logic

INFOID:0000000001082946

DTC DETECTION LOGIC

The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the heated oxygen sensor 1. The oxygen
storage capacity of the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the switching response of the sen-
sor's voltage is faster than specified during the various driving condi-
tion such as fuel-cut.

DTC CONFIRMATION PROCEDURE

1.

INSPECTION START

Do you have CONSULT-III?
Do you have CONSULT-III?

YES

>> GO TO 2.

NO

>> GO TO 11.

2.

PRECONDITIONING

NOTE:
• If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds.

• For the best results, perform DTC WORK SUPPORT at a temperature of 0 to 30

°

C (32 to 86

°

F)

• “COMPLETED” will appear on CONSULT-III screen when all tests “COND1”, “COND2” and “COND3”

are completed.

TESTING CONDITION:
Never stop engine during this procedure. If the engine is stopped, retry this procedure from 4. PER-
FORM PROCEDURE FOR COND1-I. 

SEF327R

SEF302U

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0139

Heated oxygen sensor 2 
circuit slow response

It takes more time for the sensor to respond be-
tween rich and lean than the specified time.

• Harness or connectors

(The sensor circuit is open or shorted)

• Heated oxygen sensor 2
• Fuel pressure
• Fuel injector
• Intake air leaks

P0139 HO2S2

EC-165

< COMPONENT DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

>> GO TO 3.

3.

PERFORM PROCEDURE FOR COND1

Start engine and warm it up to normal operating temperature.

>> GO TO 4.

4.

PERFORM PROCEDURE FOR COND1-I

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 5.

5.

PERFORM PROCEDURE FOR COND1-II

1.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

2.

Let engine idle 1 minute.

3.

Select “HO2S2 (B1) P0139” of “HO2S2” in “DTC WORK SUPPORT” mode with CONSULT-III.

4.

Touch “START”.

5.

Start engine and let it idle for at least 30 seconds.

6.

Rev engine up to 2,000 rpm two or three times quickly under no load.

Is “CONPLETED” appears on CONSULT-III screen?

YES 

>> GO TO 9.

NO

>> GO TO 6.

6.

PERFORM PROCEDURE FOR COND1-I

When the following conditions are met, “TESTING” will be displayed at “COND1” on the CONSULT-III screen.
Maintain the condition continuously until “TESTING” changes to “COMPLETED” (It will take approximately 60
seconds.)

Which displayed on CONSULT-III screen?

COND1: OUT OF CONDITION>>GO TO 4.
COND1: COMPLETED COND2: INCOMPLETED>>GO TO 7.
COND1: COMPLETED COND2: COMPLETED>>GO TO 8.

7.

PERFORM PROCEDURE FOR COND2

While driving, release accelerator pedal completely from the above condition until “INCOMPLETED” at
“COND2” on CONSULT-III screen has turned to “COMPLETED”. (It will take approximately 4 seconds.)

Which displayed on CONSULT-III screen?

COND2: COMPLETED COND3: INCOMPLETED>>GO TO 8.
COND2: COMPLETED COND3: COMPLETED>>GO TO 9.

8.

PERFORM PROCEDURE FOR COND3

Stop vehicle and let it idle until “INCOMPLETED” of “COND3” on CONSULT-III screen has turned to “COM-
PLETED”. (It will take a maximum of approximately 6 minutes.)

>> GO TO 9.

9.

PERFORM PROCEDURE FOR COND3-I

Touch “SELF DIAGRESULTS”.

Which displayed on CONSULT-III screen?

OK

>> INSPECTION END

NG >> Go 

to 

EC-167, "Diagnosis Procedure"

.

CAN NOT BE DIAGNOSED>>GO TO 10.

ENG SPEED

More than 1,000 rpm

B/FUEL SCHDL

More than 1.0 msec

COOLAN TEMP/S

More than 70

°

C (158

°

F)

Shift level

Suitable position

EC-166

< COMPONENT DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

P0139 HO2S2

10.

PERFORM PROCEDURE FOR COND3-II

1.

Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).

2.

Turn ignition switch ON and select “COOLAN TEMP/S” in “DATA MONITOR” mode with CONSULT-III.

3.

Start engine and warm it up while monitoring “COOLAN TEMP/S” indication on CONSULT-III.

4.

When “COOLAN TEMP/S” indication reaches to 70

°

C (158

°

F).

>> GO TO 5.

11.

PREFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EC-168, "Component Inspection"

.

NOTE:
Use component function check the overall function of the heated oxygen sensor 2 circuit. During this check, a
1st trip DTC might not be confirmed.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-168, "Component Inspection"

.

Component Function Check

INFOID:0000000001082947

1.

PERFORM COMPONENT FUNCTION CHECK-I

Without CONSULT-III

1.

Start engine and warm it up to the normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4.

Let engine idle for 1 minute.

5.

Check the voltage between ECM harness connector and ground under the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

PERFORM COMPONENT FUNCTION CHECK-II

Check the voltage between ECM harness connector and ground under the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 3.

3.

PERFORM COMPONENT FUNCTION CHECK-III

Check the voltage between ECM harness connector and ground under the following condition.

Is the inspection result normal?

ECM

Ground

Condition

Voltage

Connector

Terminal

F8

50

(HO2S2 signal)

Ground

Revving up to 4,000 rpm under no 
load at least 10 times

A change of voltage should be more than 0.12V for 1 
second during this procedure.

ECM

Ground

Condition

Voltage

Connector

Terminal

F8

50

(HO2S2 signal)

Ground

Keeping engine speed at idle for 10 minutes

A change of voltage should be more than 
0.12V for 1 second during this procedure.

ECM

Ground

Condition

Voltage

Connector

Terminal

F8

50

(HO2S2 signal)

Ground

Coasting from 80 km/h (50 MPH) in 4th gear po-
sition 

A change of voltage should be more than 
0.12V for 1 second during this procedure.